PLATE 18 
1. —Top of lower injected intemode of plant i of Ricinus communis, which on 
August 15,1916, received 1 to 100 ammonia water (one part aqua ammonia sp. gr. 0.90; 
100 parts distilled water) and which shows numerous proliferations from the ceiling. 
2. —Section 1 inch below figure 1, but above the needle entrance. This shows 
proliferations from the side wall with no dark specks on the pith. Photographed on 
October 3, 1916. X$- 
